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authorLogan Gunthorpe <logang@deltatee.com>2019-05-24 01:30:51 +0300
committerJon Mason <jdmason@kudzu.us>2019-06-13 15:59:34 +0300
commitd7cc609fb679e11dc2b00cbe6c50cbd37ec4bfa2 (patch)
treed8c7682961efed1e6b99045510c5b2cf935c64a6 /include/linux/msi.h
parenta944ccc3b0aedb7f3a24b8c90624fe182e8a8851 (diff)
downloadlinux-d7cc609fb679e11dc2b00cbe6c50cbd37ec4bfa2.tar.xz
PCI/MSI: Support allocating virtual MSI interrupts
For NTB devices, we want to be able to trigger MSI interrupts through a memory window. In these cases we may want to use more interrupts than the NTB PCI device has available in its MSI-X table. We allow for this by creating a new 'virtual' interrupt. These interrupts are allocated as usual but are not programmed into the MSI-X table (as there may not be space for them). The MSI address and data will then handled through an NTB MSI library introduced later in this series. Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Jon Mason <jdmason@kudzu.us>
Diffstat (limited to 'include/linux/msi.h')
-rw-r--r--include/linux/msi.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/msi.h b/include/linux/msi.h
index d48e919d55ae..8ad679e9d9c0 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -64,6 +64,10 @@ struct ti_sci_inta_msi_desc {
* @msg: The last set MSI message cached for reuse
* @affinity: Optional pointer to a cpu affinity mask for this descriptor
*
+ * @write_msi_msg: Callback that may be called when the MSI message
+ * address or data changes
+ * @write_msi_msg_data: Data parameter for the callback.
+ *
* @masked: [PCI MSI/X] Mask bits
* @is_msix: [PCI MSI/X] True if MSI-X
* @multiple: [PCI MSI/X] log2 num of messages allocated
@@ -90,6 +94,9 @@ struct msi_desc {
const void *iommu_cookie;
#endif
+ void (*write_msi_msg)(struct msi_desc *entry, void *data);
+ void *write_msi_msg_data;
+
union {
/* PCI MSI/X specific data */
struct {
@@ -100,6 +107,7 @@ struct msi_desc {
u8 multi_cap : 3;
u8 maskbit : 1;
u8 is_64 : 1;
+ u8 is_virtual : 1;
u16 entry_nr;
unsigned default_irq;
} msi_attrib;